Voltage regulation method for DC micro-grid

• Main Authors: WU, CAI-FU, SUN, KUN-HAN, GUO, JIA-LING, ZHANG, YUAN-ZHI
• Format: Patent
• Language: Chinese; English
• Published: 01.02.2013
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROLLING; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; PHYSICS; REGULATING; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES; SYSTEMS FOR STORING ELECTRIC ENERGY

The present invention provides a voltage regulation method for DC micro-grid, which is suitable for a DC chain connected between the regenerated energy and the bidirectional converter. The method includes the following steps: calculating the capacitance of the bidirectional converter; recording the voltage variation of the DC chain from the first time to the second time; obtaining a current command changing amount according to the voltage variation of DC chain and the capacitance of bidirectional converter so as to further find the steady-state voltage level of DC chain; and, respectively calculating the current commands of DC chain at the second time and the third time according to the steady-state voltage level to adjust the steady-state voltage level for the DC chain to reach at the third time. When the DC loading is changed, the bidirectional converter can not only employ smaller capacitance to cover a large scope of voltage variation of DC chain, but also automatically balance the loading requirement bas